Headphone waterproof MP3 player IPX7 level of waterproof Supports MP3 and WMA format Water proof for swimming Built-in 3.7V Li-lion rechargeable Battery Working time: 8 hours With 5 EQ model: Normal , Jazz, Classic, Rock , POP Up to 512M-4GB built-in flash Accories : CD driver, Manual, USB cable CE,FCC ,IPX7 approved